v 8
-20.0  20.0  20.0
 20.0  20.0  20.0
-20.0 -20.0  20.0
 20.0 -20.0  20.0
-20.0  20.0 -20.0
 20.0  20.0 -20.0
-20.0 -20.0 -20.0
 20.0 -20.0 -20.0
i 36
2 1 0
2 3 1
3 5 1
3 7 5
6 4 5
5 7 6
0 4 6
6 2 0
0 1 4
1 5 4
3 2 7
2 6 7